講演者： Kosmas Prassides氏（University of Sussex）
日時： 　９月　１２日（金）　　午後４時３０分から
場所： 青山学院大学　理工学部（相模原キャンパス）Ｌ棟６階　Ｌ６０３室

題目： 「Strongly correlated fullerene-based solids: are there any surprises left?」

要旨：
The study of strongly correlated electron systems is at the forefront
of contemporary condensed matter research because such materials which
include transition metal oxides (colossal magnetoresistive manganites,
high Tc cuprates) and intermetallic heavy fermion systems display
remarkable electronic properties that challenge existing theory for
satisfactory explanations. The interplay between charge, lattice,
orbital and magnetic degrees of freedom in all these systems can be
tuned sensitively both physically (varying an external parameter like
pressure or magnetic field) and chemically (changing the chemical 
composition). A prominent branch of strongly correlated electron systems
is the family of metal intercalated fullerides, which display 
superconductivity at temperatures as high as 40 K. In this lecture,
an overview of the structures and physical properties of selected
fullerene-based architectures will be presented with particular 
attention paid (i) to ammonia co-intercalated metal fullerides which 
are located at the boundaries of metal-insulator transitions [1] and 
(ii) to rare-earth fullerides which present opportunities based on the 
coupling between the lanthanide and fulleride electronic structures [2].

[1] S. Margadonna, K. Prassides, H. Shimoda, T. Takenobu, and Y. Iwasa,
Phys. Rev. B 2001, 64, 132414; 
S. Margadonna, E. Aslanis, and K. Prassides, 
J. Am. Chem. Soc. 2002, 124, 10146.

[2] I. Margiolaki, S. Margadonna, K. Prassides, T. Hansen, K. Ishii, 
and H. Suematsu, 
J. Am. Chem. Soc. 2002, 124, 11288;
T. Takenobu, D. H. Chi, S. Margadonna, K. Prassides, Y. Kubozono, 
A. N. Fitch, K. Kato, and Y. Iwasa, 
J. Am. Chem. Soc. 2003, 125, 1897; 
J. Arvanitidis, K. Papagelis, S. Margadonna, K. Prassides, and A. N. Fitch, 
Nature, 2003, accepted.